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Point git commmit FUN.md to gitsign! (#1874)
Signed-off-by: Billy Lynch <billy@chainguard.dev>
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| # Fun Tips And Tricks! | ||
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| ## Signing Git Commits - Three Ways! | ||
| ## Signing Git Commits | ||
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| You thought Git signatures were always GPG? | ||
| Think again! | ||
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| ### Easy Mode | ||
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| Sign the commits and store the signatures and public keys somewhere else. | ||
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| ``` | ||
| $ ./cosign sign-blob --key cosign.key <(git rev-parse HEAD) | ||
| Using payload from: /dev/fd/63 | ||
| Enter password for private key: | ||
| MEUCIQDLtTbCRCW+o7Gt3WKR4b2UqT947L8JtYzQJk+R8PItxgIgXoYQg1YXw8xDmGWun6wIG2t+/J0HJs9SbscnSLMNWsM= | ||
| $ git rev-parse HEAD | ||
| 455d1988360dcfdcf0fa17b0736fbbc33b4924c0 | ||
| $ ./cosign verify-blob --key cosign.pub --signature MEUCIQDLtTbCRCW+o7Gt3WKR4b2UqT947L8JtYzQJk+R8PItxgIgXoYQg1YXw8xDmGWun6wIG2t+/J0HJs9SbscnSLMNWsM= <(git rev-parse HEAD) | ||
| Verified OK | ||
| ``` | ||
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| ### Medium Mode | ||
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| Store the signature in the repo as notes, store the public key somewhere else. | ||
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| ``` | ||
| $ ./cosign sign-blob --key cosign.key <(git rev-parse HEAD) | ||
| Using payload from: /dev/fd/63 | ||
| Enter password for private key: | ||
| MEQCIHXN31pDrZBxs+m/HrcFruavv++oMc+pBZKgl7Hps9jjAiA9QE5uzpFNC5SGpdr4TJuCwh47C24Hwt4yHICae0J1bw== | ||
| $ git notes add -m "MEQCIHXN31pDrZBxs+m/HrcFruavv++oMc+pBZKgl7Hps9jjAiA9QE5uzpFNC5SGpdr4TJuCwh47C24Hwt4yHICae0J1bw==" HEAD | ||
| $ ./cosign verify-blob --key cosign.pub --signature <(git notes show HEAD) <(git rev-parse HEAD) | ||
| Verified OK | ||
| ``` | ||
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| ### Hard Mode | ||
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| Store the signature in the Transparency Log, and store the public key somewhere else. | ||
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| ``` | ||
| $ COSIGN_EXPERIMENTAL=1 ./cosign sign-blob --key cosign.key <(git rev-parse HEAD) | ||
| Using payload from: /dev/fd/63 | ||
| Enter password for private key: | ||
| MEYCIQDWX6RjU0Z2ynd1CdiAwo/JaC2Z5+vdx8H5spuDNu/r5wIhAPnP+87+knFEwbE8FgeXCrgkjWal3aBsNR3IVaBDT2XU | ||
| tlog entry created with index: 1224 | ||
| ``` | ||
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| Now find it from the log: | ||
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| ``` | ||
| $ uuid=$(rekor-cli search --artifact <(git rev-parse HEAD) | tail -n 1) | ||
| $ sig=$(rekor-cli get --uuid=$uuid --format=json | jq -r .Body.RekordObj.signature.content) | ||
| $ cosign verify-blob --key cosign.pub --signature <(echo $sig) <(git rev-parse HEAD) | ||
| Verified OK | ||
| ``` | ||
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| You can also get the public key from the log: | ||
| ``` | ||
| $ uuid=$(rekor-cli search --artifact <(git rev-parse HEAD) | tail -n 1) | ||
| $ sig=$(rekor-cli get --uuid=$uuid --format=json | jq -r .Body.RekordObj.signature.content) | ||
| $ pubKey=$(rekor-cli get --uuid=$uuid --format=json | jq -r .Body.RekordObj.signature.publicKey.content) | ||
| $ cosign verify-blob -key <(echo $pubKey | base64 --decode) --signature <(echo $sig) <(git rev-parse HEAD) | ||
| ``` | ||
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| ### Level 11 | ||
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| Store the signature in the Transparency Log and don't store the keys anywhere. | ||
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| ``` | ||
| $ COSIGN_EXPERIMENTAL=1 ./cosign sign-blob <(git rev-parse HEAD) | ||
| Using payload from: /dev/fd/63 | ||
| Generating ephemeral keys... | ||
| Retrieving signed certificate... | ||
| Your browser will now be opened to: | ||
| https://oauth2.sigstore.dev/auth/auth?access_type=online&client_id=sigstore&code_challenge=fJXMfR2VOiudrU2X1kP4UUSf3v33yyl3o2IexzIaEdc&code_challenge_method=S256&nonce=1zkBCegjVlHrfXywXu3lsT0RVP7&redirect_uri=http%3A%2F%2Flocalhost%3A5556%2Fauth%2Fcallback&response_type=code&scope=openid+email&state=1zkBCehKiBjIMt1J2hcTYhBae9s | ||
| Successfully verified SCT... | ||
| signing with ephemeral certificate: | ||
| -----BEGIN CERTIFICATE----- | ||
| MIICeDCCAf6gAwIBAgIUAPcTDhgn++dgD7008s+TuiLwUgcwCgYIKoZIzj0EAwMw | ||
| KjEVMBMGA1UEChMMc2lnc3RvcmUuZGV2MREwDwYDVQQDEwhzaWdzdG9yZTAeFw0y | ||
| MTEwMTkyMjIxMjZaFw0yMTEwMTkyMjQxMjVaMAAwWTATBgcqhkjOPQIBBggqhkjO | ||
| PQMBBwNCAASkOb5x7wCiyBLs7Q0ehqD31U6Lr+x0kH9WDcp5ONm7WBeGTAyth5Rz | ||
| gJBpkVtv/UzgF5BNKUfEVtm8pal7sZBso4IBKjCCASYwDgYDVR0PAQH/BAQDAgeA | ||
| MBMGA1UdJQQMMAoGCCsGAQUFBwMDMAwGA1UdEwEB/wQCMAAwHQYDVR0OBBYEFAP3 | ||
| +cBsWpnLMQvm0Tv6qCVQ0PYiMB8GA1UdIwQYMBaAFMjFHQBBmiQpMlEk6w2uSu1K | ||
| BtPsMIGNBggrBgEFBQcBAQSBgDB+MHwGCCsGAQUFBzAChnBodHRwOi8vcHJpdmF0 | ||
| ZWNhLWNvbnRlbnQtNjAzZmU3ZTctMDAwMC0yMjI3LWJmNzUtZjRmNWU4MGQyOTU0 | ||
| LnN0b3JhZ2UuZ29vZ2xlYXBpcy5jb20vY2EzNmExZTk2MjQyYjlmY2IxNDYvY2Eu | ||
| Y3J0MCEGA1UdEQEB/wQXMBWBE3ByaXlhdzgxOUBnbWFpbC5jb20wCgYIKoZIzj0E | ||
| AwMDaAAwZQIxAL2tZYELi3hGJS8sGTCGPKz83brdM4aak0v+SMMQGnyas7bY7tdm | ||
| DoyAJmxwWx2ntQIwPyM1A5nE+f2Pg9CkQqyZEFS2sxQTdKBmQzODDn6GqVTJ7agN | ||
| 2djlcXFUJb1xFwO5 | ||
| -----END CERTIFICATE----- | ||
| tlog entry created with index: 782549 | ||
| MEUCIGi9CuxAceEcNkGLani2i3GdMgbl4bkGLILDhjh8n7DAAiEAhRwgfXMhnXyB38EZtOZX7fwtJBaSetMM88mZyYsV0pM= | ||
| ``` | ||
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| Now find it from the log: | ||
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| ``` | ||
| $ uuid=$(rekor-cli search --artifact <(git rev-parse HEAD) | tail -n 1) | ||
| $ sig=$(rekor-cli get --uuid=$uuid --format=json | jq -r .Body.HashedRecordObj.signature.content) | ||
| $ cert=$(rekor-cli get --uuid=$uuid --format=json | jq -r .Body.HashedRecordObj.signature.publicKey.content) | ||
| $ cosign verify-blob --cert <(echo $cert | base64 --decode) --signature <(echo $sig) <(git rev-parse HEAD) | ||
| Certificate is trusted by Fulcio Root CA | ||
| Email: [your-email@yay.com] | ||
| Verified OK | ||
| ``` | ||
| Git commit signing has been broken out into its own project! Check out | ||
| https://github.com/sigstore/gitsign for more. |